How To Run Parallel Test With Multiple Browsers With Selenium Webdriver
As teams move towards the continuous development and delivery model for the software world, they are exploring solutions to accelerate their delivery. The QA team tries to do this by reducing testing time. Often the wrong approach taken is to reduce test coverage based on risk analysis by testing only on limited browsers, browser versions and operating systems based on target audience usage. maximum spending. However, if teams switch from sequential testing to parallel testing, the groups can achieve maximum coverage with reduced execution time. The new era of continuous testing, along with parallel testing, helps drive this approach. So first, let’s understand parallel testing more. Read: how to run cross-browser parallel tests using selenium webdriver
What is Parallel Testing (also known as Parallel Test Execution)?
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In parallel testing, we test different modules or apps side-by-side across multiple browsers instead of each. Parallel testing is different from sequential testing in that we test different modules or functions one after another. Even in the case of cross-browser application testing, the tests are performed sequentially on different browsers. This testing approach is very time consuming. Parallel testing reduces implementation time and effort and leads to faster delivery times. It proves useful especially in case of cross browser testing, compatibility testing, localization and internal testing. In case we have two versions of the software available and we need to test its stability and compatibility, we can run the two versions simultaneously and find the problem at a much faster rate. . parallel testing using Selenium with TestNG.
Parallel testing using TestNG and Selenium
Read more: how to see who poked you on facebook appTestNG is a testing framework for Java that helps organize tests in a structured way and improves maintainability and readability of scripts. TestNG has made automation easier for testers thanks to its large feature set. One of them is parallel testing or parallel execution. TestNG provides an automatically defined XML file where one can set parallel property to method/tests/classes and by using Java’s concept of multithreading one can set the number of threads that one wants to create for parallel execution. Here is the structure to define this attribute in TestNG XML:
- Method: Helps to run methods in separate threads
- Test: Helps to run all methods belonging to the same tag in the same thread
- Classes: Helps to run all methods of a class in a single thread
- Version: Help to run all methods in the same instance in the same thread
Together with the parallelism property, the thread count property helps to determine the number of threads one wants to create while running parallel tests. For example, in case one has three methods, with the number of threads being two, then during execution, the two threads will start parallel with their respective methods. When the first method’s execution completes and the thread is released, it takes up the next method in the queue. Run Selenium Test for FreeLet see the code snippet to understand the parallel execution process. In the example below, I have created two methods. One uses chrome to open the Browserstack homepage, where the other uses the firefox browser to register on the Browserstack platform. In this code snippet, we are implementing both these methods in parallel, by setting the number of threads in the TestNG XML file to 2. Refer to the below code and the TestNG XML file: import topqa.inforClass; enter topqa.info; enter topqa.info; enter topqa.infoUnit; enter topqa.info; enter topqa.inforiver; enter topqa.infomeDriver; enter topqa.infoDriver; enter topqa.infofoxDriver; enter topqa.infornetExplorerDriver; enter topqa.info; driver public class ParallelTestWithMultiThread {WebDriver; @Test() public void testOnChromeWithBrowserStackUrl() {topqa.inforoperty (“webdriver.chrome.driver”, “.Driverchromedriver.exe”); driver = new ChromeDriver(); topqa.infoge(). timeouts(). implicitWait(10, topqa.infoNDS); topqa.info (“https://www.browserstack.com/”); topqa.infoge(). window (). Maxim(); topqa.infotln (“this is a test related to chrome browserstack homepage” + ”” + Thread.currentThread().getId()); } @Test() public void testOnChromeWithBrowserStackSignUp() {topqa.inforoperty (“webdriver.gecko.driver”, “.Drivergeckodriver.exe”); driver = new FirefoxDriver(); topqa.infoge(). timeouts(). implicitWait(10, topqa.infoNDS); topqa.info (“https://www.browserstack.com/users/sign_up”); topqa.infoge(). window (). Maxim(); topqa.infoElement (By.id (“user_full_name”)). sendKeys (“Sadhvi Singh”); topqa.infoElement (By.id (“user_email_login”)). sendKeys (“[email protected]”); topqa.infoElement (By.id (“user_password”)). sendKeys (“browserstack”); topqa.infotln (“this is a test related to login chrome browserstack” + ”” + Thread.currentThread().getId()); } @AfterClass public void close() {topqa.info(); }} TestNG Xml file:
Execution Race – Parallelization vs Serialization
Let’s take a look at an interesting case study that will provide a clearer view of how parallelization makes testing faster and yields better RoI. Let’s look at the same piece of code containing two methods, which will run in parallel on two different browsers, one is testing on Chrome and the other is testing on Firefox. In an execution case, we will run methods one by one. by one, while in the other we will run both methods in parallel with 2 threads created concurrently. The image below shows the time it takes to execute both methods one after another, i.e. one after the other:
The image below shows the parallel execution time of both methods:
From the above statistics, we can see that doing a parallel test takes almost 1.5 times less time than serialization. With this reduced lead time, we were able to complete the test cycle faster, which resulted in faster delivery and also resulted in better ROI.
Disadvantages of Parallel Testing
- In case of parallel running, in order for different modules to run in parallel, we need to create independent modules. Modules with dependencies cannot be included in the parallel approach.
- For parallelization, one needs to understand the details of the product and its flow for better results. While parallelism can help with cross-browser compatibility testing, its cross-browser coverage is limited until and unless it is accompanied by distributed testing where multiple setups are made. machine and browser provided
The era of cloud-based testing
Due to the need to have access to multiple platforms and browsers to run tests in parallel, the cost of compatibility testing with parallel testing increases. In addition, we may come to a point where we cannot access all browsers and versions. BrowserStack provides access to multiple platforms and browsers with their respective versions in the cloud. One can run parallel tests automatically and using multiple browsers and versions. Read more: how to use the epic turkey call
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